A) Hematoxylin and eosin staining (× 20).B) Immunohistochemical staining of PD-L1 (× 20).PD-L1, programmed cell death 1 ligand 1A) Abdominal computed tomography shows bowel wall thickening.B) Mucosal erythema. C) Rectal mucosa with abundant inflammatory cells and atrophic crypt abscess (× 20).D) Prominent crypt epithelial apoptosis (× 40).394received concurrent radiation chemotherapy (i.e., carboplatin + paclitaxel + radiation with 60 Gy in 30 fractions). This treatment was followed by Figure 2 Computed tomography, endoscopy, and histopathological findings of the colonFigure 1 Transbronchial biopsy of squamous cell carcinomaABACBDmaintenance therapy with durvalumab at 2-week intervals. Six months after completion of first-line chemoradiotherapy, he received additional chemo-
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